Truing-up indicator.



N0. 826,971. PATENTED JULY 24, 1906.

B. F. STOWELL. TRUING-UP INDICATOR.

APPLIOATION FILED APB. 23,'1906.4

' 'LA f l' l h im@ i Y] i '1 I vice that it is most readily capable of making tion.

UNITED STATES PATENT oEEICE.

Specification of Letters Patent.

Patented J'u1y 24, i966.

Application filed April 23, 1906. Serial No. 313.164-

To a/ZZ ruiz/0in, it may concern:

Be it known that I, BYRON F. STowELL, a

citizen ofthe United States of America, and

a resident of S ringfield, in the county of Hampden and tate of Massachusetts, have invented certain new and useful Improvements in Truin -Up-lndicators, of which the following is'a ll, clear, and exact descrip- This invention relatesto improvements in indicators available especially in machineshops and to be used more often as a centering-indicator to determine if a part in a lathe is chucked truly in alinement with thevheadiand tail stock centers, the same, however, being capable of utilization for determining the accuracy of plane surfaces, suchW as the face of a plate or piece rotatably mounted in a lathe or carried on a planer-bed, and an indicator of the class to which this invention relates may be employed otherwise than as above mentioned. v

Aleading object is to so construct the deits indication of the extent that the Work is off from center or out of true irrespective of the line of direction 'of presentation of the contactin portion of the indicating device against t e piece the accuracy in sha e or positioning of whichis to be determine Other objects are to acquire simplicit and cheapness of construction and genera efficiency; and the invention consists in an indicating device constituted as hereinafter fully described, and set forth in the claims.

In the drawings, Figure l isa front view of the device with the front plate of its casing removed for disclosing more clearly the indicator constructions and having an end portion thereof broken away in longitudinal section. Fig. 2 is a top edge or plan view. Figs. 3 and 4 are perspective views showing lever-like parts comprised in the indicator.

Fig. 5 is a perspective view of .the stud, andV Fig. 6 is a erspective view of the indicator-fN e .actuating s 'de-bar with which the stud coacts.

` Similar characters of reference indicate corres1p1ondingrparts in all of the views.

the awings, A represents the holder, carried by a shank or supportin -bar B,

which is swivel-connected, so that t e casingl portion a, in which the indicator proper, C, is

inclosed, may have a rotational motion on an axis coincident with the length of the shankbar, which latter is vitself jointed at b, so that one part may be swung angular to the other for general convenience in the employment of the device.

The holder A has an extension d projecting from the vertical edge of the casing in a direction o positely from the shank-bar, and through t 's extension d is a straight round hole or bore f, communicati with the space within the casing. The sai hole or bore is greatly widened at the outer end of the extension d to constitute a cylindrical socket or chamber g. l

The upper edge of thecasing is of convex form and has a slot or apertureh therethrough, along which may play the extremity of the pointer ofthe indicator fC, which part is constructed in the form of a lever i, 'the lower ortion of which is pivoted at j ,within andpat an intermediate part of the casing c. The spring k exerts a tendency to maintain the pointer end of the lever i at the left-hand end of the slot h. The lever m is pivotally mounted and depends from an upper part of the casing and is `bylinked lever m connected with the pointer-lever i. Another lever n is at its lower endpivoted in a lower portion of the casing and has `its angularlyturned ulpper extremity n in engagement commodated'in the chamber enlargement g.

D represents a stud which by its form and arrangement for coaction relatively to the other parts of the device is a very important,

constituent in this inventien, and it will be perceived that said stud 1s formed with a steni p, a ball en d g, outwardly located anda flange or enlar ement t at its inner end c1rcular in form an having its inner face plane or flat, and the diameter of this flange or stud enlargement is enough less than the diameter of the chamber enlargement g yto permit the stud to have a rocking or swinging movement in any direction transverselT o its normal axis.

u represents an annularl retainer fitted 1n l the orifice of the chamber enlargements g and preventing the outward displacement of the stud and actuating-bar o.

Normally the parts of the indicator are maintained with the point of'the'indicat'or leverat one end of the slot JL, the actuatingbar o forced to its outward limit andin hat' face contact against the stud-Hange't, which is'crowded closely against the retaining-ring u, with its flat inner endrface in' a' plane'truly perpendicular to the axis of the bar o, and the ore in Which these (parts are disposed. Of course any pressure irectly1 endwise' against the Stud Will croWdthe latterendwise' Wardl'y, directly transmitting'motion to 'the indicator-actuating bar o to; give the roper indication by the pointer 'i onthegra uated edge'o the casing; but in thepresentaton' of the indicator so that the' studhas contact a ainst the piece the accuracy or positlomng o rwhich is to be determined, so that the-line of bearing force betweenthe contactin parts-'isin any degree angular to the'norma axisofthebar o and studis such as'to'im art a' rocking movement'to the stud, it Wil as Will be clearly understood'on reference' to Fig. 1, exert an inwardly-crowding action against the-bar for the actuationof thein'dilcator, and there'is no line or direction-of resentation-Which the projecting-portion o the stud may practically have` against any part or piecegofwork Whi'ch Would not be eii'e'ctive tocause throughthe medium of the studan ments, to actuate'the indicator.

' ble of roc sus . holderA carrying. an indicatingv device which of lts length, for t actuation of -the indicator;

Iclaimv 1. A 4Work-trui'n'g device consisting ol'V a holder carrying an indicator movajble" therein, and afstud comprising a portion rojectingf beyond the ho der, and for'. en wise or si eWisecontact against the Work to be` trued, and ha its opposite end'portion non-attached to, ut in contact against, an adjacent movable part ofthe indicator'v and capable of rocking. movements of its length, in' said'holder, and operable, either by endwise'- thrust, or its rocking movetransversely 4. A Work-truing device consisting of a holder comprising a casing formed with, an apertui'ed'top or side, and said holder having a longitudinal bore in communication with the casing-opening made with a widened cylindrical chamber, a pointer pivotally mounted in said chamber .and with its extremity protruding' through said aperture,l levers pivotally mounted in the chamber articulated one with another and with the oint'erLlev'er, a barslidable in said` bore` and `avin'gran' enlarged flat-,faced end or hea'd, a st'udhavin .aiiangedorwidened'` lateaced' inner'end' ocated in' the chambered e'nla'rgemex'itior` said bore` and having; its end face' against' the enlarged'iiat end face'of saidbar; and having a `stemI projecting'tothe'exterior of the holder, and ca able of a rocking moveV- ment" relatively to4 the' latter, .and means* for retaining the said 'stud-v against'displacement' from the' holder. i

5. A Work-truin'g device' consistingso a holder comprising a'casing vmade withaf'slot or aperture` and havingfa bore through-a porL tion thereof Which communicateswith-the an'd has'alr'eniargedopeningrin said casing cylindrical lchamberat the'outerfend'th'ereof,

'm 2 bearing a movable indicator' inf saidcasing" appur;

tenant' to whichis'an -actuatingsbar'- sli'dable 'ni said boreand having anfenlarged head Within said cylindrical enlargement; 'a-f stud com rising' a'-l stem",- and an=inn'er"en"d flatace' ian e',smaller`in diameter than that'of the' cham `er enlargement, andanannular end of the'hold'erifor'retaining'the' partat the stud-lianein itscoperativeproximityto the outer-:en of said actuating-bar.

, 6. A virork-truing` device consisting', of a holder havin "a easihg. mader with a-'sl'ot or aperture, an having a-borefv through a-p'ort1on thereof Which'conrmunica'tes Witl'sa-id' opening in the casing, anindicatingdevic'e consistlng'ofa pointer-leverpivoted inthe casing and pro'e'ct .'throughfsaid'aperture, a lever pivoted inllthe'7 casinglanddinked' to the' pointer-lever; another lever" pivotedsin thev casing-r and having. an` anguiarly-tmned extremity in contactagainst the' hn'kscon'- Ipo IIO

nected lever' ad'acentfitspivot, and a vbar movable'insaid4 ore and ha Y' fits'innerfend 11n-"engagement with` said ahgllgn 'gether' with 'afstud end-wise engagingisaid 'bar and capable' of rocking'.` movementj trans'- versely of its'lefnth, in-said holder, and'opie'l*V abletoendwise orce saidbar.

Signed by me at Springfield, Massaehw setts, in presence of two"sub'scribin'g; Witnesses. i t Y l BYRON F. 'lliitnesseiss4 Y 4 v WM.S.BE'L-nows;

(ln-R; Dnlsconn. 

